In order to appraise and examine grinding wheels, numerous requirements are placed on the testing method used. The most important are that the testing method is damage-free, is independent of the attendant and provides reproducible results. These requirements are oriented by the conditions of the call for proposals of the Vereins Deutscher Werkzeugmaschinenfabriken e. V. (VDW) in the year 1922.
Testing procedures are already applied in the first steps of grinding wheel production. After an inspection of the point of half sphere of the bond, which should ensure sufficient fusing in the furnace, test blocks are checked for their fracture resistance in bending tests. The density of the test body is also examined.
To assess grinding wheel porosity, there are still no satisfactory testing methods. For testing grinding wheel hardness, there are various testing methods that are recognised and used in industry.